Steam-generator



(k0 Model.)

. O. F. KNAPP.

STEAM GENERATOR.

PatentedJuly 12 Invantur Witnesses:

ATTORN EY.

To all whom it men concern.-

VQNITED STATES PATENT OFFICE.

oscAR F. KNAPP, oF oscEoLA MILLS, Wisconsin.

steam-assumes,

- srscmrcnnonre nn part of Letters Patent No. 366,223, dated July 12, 1887.

' Application flied Apr-l 5, an. serial no. art-m9. m mnaii Be it known that I, OSCAR F/KNAPP, a

. citizen of the United States, residing at Osceola Mills, in the county of Folk and State of Wisconsin, have invented a new and useful Improvement in Steam-Generators, of which the following is a specification.

My invention relates to steam-generators in which a central cylinder provided with radiati ng sprocket-tubes is surrounded by a water j aeket or boiler, the same being connected with the inner cylinder by means of retnrntubes at the bottom communicating below the gratehars with the outer shell of the boiler, the object beingto secure the greatestamonnt-of heating-surface and establish a perfect circulation. I attain these objects by means of the sprocket-tubes and the retu rn-tube.

device shown in the accompanying drawings, in which-- Figure 1 is a vertical section of my steamgenerator, showing the arrangement of the Fig. 2 is a horizontal section of my steam generator, showing a plan view of the sprocket-tubes and the smoke-fines. I

Similar letters refer to similar parts throughout the several views.

I make an outer shell or easing of a cylindrieal form, as A. Within this shell A, I make a second shell, 13, alsorof a cylindrical form, and between the twoshells A and B is a waterspace. Above the body of the boiler, attached to the outer shell, A, at a convenient distance, I make a hood or smoke-jacket, D, which is cylindrical in front, running up to a line level with the top of the outer shell, A, where it narrows in a cone to the stack. Upon the top of the outer shell, A, I make acrowusheet, 0, and at a convenient distance below the crown-sheet C, I make a diaphragm, C, perforated at 9. Between the diaphragm 0 and the crown-sheetC is a space partially filled with water and steam, the water-level being near the center by holes 9, which communicate with the central drum,'E, of the boiler. From this central drum, E, at convenient points are radial tube's K branching out from the drum. These tubes K are closed at the between the outer shell of. the boiler and the inner shell or-drnm, E, through the tube Gand the holes g in the lower sheet, 0'. At the extreme lower end of the drum E, below the openings of tube G, I make a mud-drum, F, from which, passing through the outer-shell of the boiler, is a blow-off pipe, F, which passes through the ash-pit I. 0n the end of the drum E'and mud drum h is a man-hole plate, Y. To the circulation-tube G, at a convenient point, I make the pipe G, for supplying the feed-water. The inner shell, B, of the boiler near the bottom I flare outward, so as to expand the inner chamber of the boiler-andincrease the fire-box H, which is provided with grate bars H. Having provided the boiler with a steam-pipe, L, from the drum of the boiler, and carrying a stay-bolt through the crown-sheet C down through the drum E, mud-drum F, and manhole plate Y, the device is complete.

Having thus described the parts of my invcntien, I now proceed to explain the method of operating the same, I fill the boiler up to the dotted line indicated between the crownsheets 0 and C and fire the boiler in the firebox H. pipes K and the drum E, passing out through the openings 0, passes around the steam-dome C and out of the smoke-hood D. The water, being heated in the pipes K and drum E, rises and flows into the steam-dome G", where, imparting its heat to the steam, it becomes cooled and flows down to the bottom of the boilerbetween the inner shell, B, and the outer shell, A, passing around and under the grate-bars H through the fines G, thence to the d rum E, establishing a perfect circulation.

What I claim, therefore, and. desire to 'se-' cure by Letters Patent, is 7 v 1. In a steam-generator, the combination of thesmoke-jacket D, outer shell, A, steam and water dorhe- C", fines e, cylinder E, sprockettnbe'sv K, and inner shell, B, combined with the circulating-tubes G and circular fire-box and grate-bars H, all arranged and operatin substantially as set forth.

2. In a steam-generator, the combination of the smoke-jacket D, outer shell, A, steam and 4 water dome C", flnes e, cylinder E, sprocket- .tnhe K, inner shell, B, circulating-tube G, circular firebox-and grate-bars H, combined with the mud-drum F, blow-01f pipe F, and

bolt d,- all arranged and operating snbstan tielly as set forth.

3. The new article of manufacture, consistcomponent parts, a smoke jacket, D, outer shell, A, inner-shell, B, steam and water dome C", fines 0, cylinder E, sprocket-tube K, steampipe L, circulating-tube G, inlet-pipe G, cirenlar fire-box and gratebars Emmi-drum F, blow-off pipe F, man-head Y, and ash-pit I, with the bolt d, all arranged and operating substantially as set forth and described.

OSCAR'F. KNAPP;

In presence of H. HnUPT, J12, J. TAYLOR.

ing 'of a. steam-generator composed'of the 

